String nailing-machine.



S. A. DOBYNE.

STRING NAILING MACHINE. APPLICATION FILED MAR. 18, 1912v 1,091,299,,Patented Mar. 24, 1914 2 SHEETS-SHEET 1.

S. A. DOBYNE.

' STRING NAILING MACHINE.

APPLICATION FILED MAR 18, 1912.

1,091,299. Patented Mr. 24, 191 1 2 SHEETS-SHEET 2.

UNITED STATES PATENT. OFFICE. srnrnnn a DOBYNE, or" 's'r. otus,Mrssounr, assrenon fro enanrron SHOE MACHINERY COMPANY, or s'r.nocrsmrssouar, a coaroan'non or mssouar.

- Specification of Letters Patent. Application filed March 18, 1912.Serial No, 684,653.

To all whom it may concern:

Be it known that I, STEPHEN A. DonYnn,

a citizen of the United States, and resldmg at St. Louis, 'in the Stateof .Missour1,have invented certain new and useful Improvements in StringNailing-Machines, of wh1ch the following is a specification. Y Thisinvention relates to nailing machines, and more particularly tonailingmachmes of the type known as string nallmg machines.

This invention as to certain of its features is an improvement on themachine shown and described in-Patent No. 1,026,028, granted May 14,1912. v v

One of the objects of this invention is to arrange the mechanism andprovide means whereby a fastener may be properly positioned in thefastener-guiding and receiving throat so that it may properly dnven bythe driver. 1

Furtherobjec'ts will appear from the detail description taken inconnection with the accompanying drawings in which:

Figuiie 1 is a front elevation of a machlne embody ng this invention,and Fig. 2 is a similar /view with the mechanism in another position.

Referring to the accompanying drawings,

15 designates the machine head which sup-- ports the fastener insertingmechanism. A driver 16 is mounted in the. lower end of a driver bar 17which is, supported in bearings on the head and connected by a pitman 18to a crank '19 on the'drive shaft 20. A throat 21 is-pivoted at 22 onthe head and has cooperating therewith, a string na1l guide 23 alsopivoted at 22 and moved clockwise by means of a spring 24. A cutterblade 25 is mounted upon an arm 25 p1voted on a lever 26 and yieldinglyconnected therewith through a spring 26. The lever 26 is pivoted on thehead and 1s provlded with a fork embracing and engagln an eccentric 27mounted uponthe drive s aft. An 'awl 28 is mounted upon an awl carrier29 which in turn is mounted for swinging and sliding movement in themachine head. The awl carrier is swung by means of a lever 30 having .acam roll engaging a cam track in the cam wheel 31 and is slid by meansof .a lever 32 having a cam roll 33 1n a counter-clockwise direction bymeans of a lever 35 having a: cam roll engaging a cam surface on camwheel 31. r Y

The mechanism is 's 1 1bstantially of the same construction as themechanism shown and described 'in. application Serial No. 724,680, filedOctober 8, v.1912. During the operation of the machine the awl carrieroperates the awl to pierce and feed the work, and also engages and movesthe throat from. the position shown in Fig. 1 to the position shown inFig. 2, and the throat is returned by means of a spring and the arm 35,as fully described in said appli Patented 'Mar. 24, 1914.

engaging a cam 34. The throat 'is moved 25 is moved downwardly thespring 26 is compressed and the cutter bears against'the string nailguide so as to move the lower end of the; same to the right Fig. 1. Asthis cutter engages the top face of the throat further movement impartedthrough the lever 26 will cause the cutter to move to the right Fig, 1and cut the lowermost nail from the string. In Fig. 2 the parts areshown 1n position just after a'nail has been'severed. The cutter is nowunder tension and bears not only with considerable .force against thestring nailguide, but also upon the upper face of the'throat. If now thethroat is moved back to position in alinement with the driverimmediately after the nail has been severed-,- the cutter bearing on thehead 7 of the cut nail will tend to move the head thereof to the left(Fig. 2) and thus displace it in the throat so that it will not beproperly positioned with respect to the driver, thereby causing thedriver to break. It is necessary that the driver passage be wider at thetop than the head of the nail so as to permit the lowermost nail tostart to feed into'the throat as the throat and string nail guide moveinto cooperative relation. This construction although necessary, willcause the nail to be displaced in the throat by thecutter.

in accordance with this invention the co centric 27 and the cam 34: areso constructed and so positioned relatively on the drive shaft and withrespect to their fork and cam roll, that the pressure of the cutter onthe upper face of the throat will be relieved before the throat startsto swing back into alinement'with the driver. This is shown in Fig. 2.In this figure the eccentric 27 is at dead center with respect to itsfork and is ready to start to move the lever 26 clockwise. The cam 34:is however at this time in full engagement with its cam roll 33 and willremain in engagement therewith while the drive shaft turns through ashort arc.

The lever 26 will therefore he swung on its pivot for a short distancein a clockwise direction before the awl begins to move to the right andbefore the throat begins to move back to its position in alinement withthe driver. The tension of the spring 26 (which is compressed when theparts are in the position shown in Fig. 2) is thus relieved so as torelieve the pressure of the cutter on the throat and on the head of thenail in the driver passage before this throat starts to move back intoalinement with the driver, The parts are so arranged as not only torelieve the tension of the spring, but also. to raise and retract thecutter a short distance from the upper face of the throat before thethroat starts to move back. As the pressure of the cutter is thusrelieved, this cutter will not'bear upon the head of the nail in thethroat, so that this nail is not displaced when the throat is moved backinto alinement with the driver.

The throat is shown and described in my divisional application SerialNo. 774,379, filed June 18, 1913.

Ttis obvious that various changes may be made in the details ofconstruction without departing from this invention, and it is thereforeto be understood that this invention is not to be limited to thespecific construction shown; and described.

Having thus described the invention what is claimedis:

1. In a fastener inserting machine, the combination with a driver, amovabie die member, and a cooperating cutter, of means for moving saiddie member and cutter into and out of cooperative relation constructedand arranged to relieve the pressure of said cutter on the cut nailbefore said die memher and cutter begin to move out cooperativerelation.

2. in a fastener inserting machine, the combination with a driver, afastener stool; guide, a die member, and a ter, of means for moving 8member into and out uoenaee tion, means for operating said cutter to cuta fastener from the fastener stock constructed to relieve the pressureof said cutter on the cut nail before said first means operates to movesaid guide and die member out of coiiperative relation.

3. In a fastener inserting machine, the combination with a driver, afastener stock guide, a throat, and a cutter cooperating with saidthroat, of operating means for movingsaid throat into and out ofalinement with said driver, and means for operating said cutter to cut afastener from the fastener stock, the operating means for said throatand cutter being constructed and arranged to relieve the pressure ofsaid cutter on the cut fastener before said throat begins to move intoalinement with said driver.

4. In a fastener inserting machine, the combination with a driver, afastener stock guide, a throat forming a die, and a coo'perating cutter,of operating means for moving said throat into and out of alinement withsaid driver, and means for operating said cutter to cut a fastener fromthe fastener stock, the operating means for said throat and cutter beingconstructed and arranged to relieve the pressure of said cutter on thehead of the cut fastener in said throat before said throat begins tomove into alinement with said driver.

5, In a fastener inserting machine, the

combination with a driver, a fastener stock guide, a throat, and acutter cooperating with said throat, of'operating means for moving saidthroat into and out of slime ment with said driver, and means foropcrating said cutter to cut a fastener from the fastener stock, theoperating means for said throat and said cutter being constructed andarranged to begin the retracting movementof said cutter before beginningto return said. throat into alincment with said driver.

6, In a fastener inserting machine, the combination with a driver, afastener stock guide, throat, and a cutter coiipcrating with saidthroat, of operating means for moving said throat into and out ofalincment with said driver, and means for operating said cutter to cut afastener from the fastener stool? while said throat is out of alinementwith said driver. the operating 'means for said throat and said cutterbeing constructed to partially retract said cutter before the throatbegins to move into aiinemcnt with said driver.

insertin combination. -.Vitli a guide iis. a

machine, he a string of driver, a throat movable inement it said driver,A id cutting:

id cut the er in said ,1 instructed member conpressure of said feedinand cutting member on the fastener in sa (1 throat before said throatmoves into, alinement with said driver. I I

8. Ina fastener inserting machine, the combinationv with a guide for astring of connected nails a driver, a throat movable into and out ofalinement with said driver, and a feeding and cutting member constructedto feedthe string into said throat and cooperate\ therewith to out afastener from the stri g, and operating means constructed to artiallyretract said feeding and cutting member before said throat begins tomove into alinement with said driver.

9. In a fastener inserting machine, the combination with a guide for astring of connected nails, a driver, a throat movable into and out ofalinement with said driver, and

a feeding and cutting member constructed to feed the string into saidthroat and cooperate therewith to cut a fastener from the string, andoperating means constructed to bowed upwardly at its center with respectI to said throat.

In testimony whereof I aflix my signature in presence of two witnesses.

STEPHEN A. DOBYN E.

Witnesses: v J. H. BRUNINGA, BOY J DIXON.

